AC Not Cold and Bad Smell in Traffic
The AC works well on the highway but blows warm air in traffic, accompanied by a bad smell. This suggests a refrigerant issue, a failing condenser fan, or a clogged evaporator causing odor.
Diagnosis Details
Possible Causes
Low refrigerant charge due to a small leak, causing reduced cooling at low speeds
Faulty condenser fan not pulling air through the radiator at idle, reducing AC efficiency
Clogged or dirty evaporator core causing bad smell and reduced airflow
Failing AC compressor clutch or control valve, intermittent operation
Related OBD-II Codes
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What You Should Do
Check refrigerant pressure with a manifold gauge set; inspect condenser fan operation at idle; inspect cabin air filter and evaporator for mold or debris.
If low on refrigerant, repair leaks and recharge.
Clean or replace cabin air filter and treat evaporator with antimicrobial spray.
Related Repairs
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
